Precision Low-voltage Digital Delay Circuit In The High-voltage High-current Electromagnetic Compatibility

The equipment for delay time is the important buildup component in system. In recent years, as the request of more miniaturization system, we begin to develope a new-style low voltage digital delay time circuit. To make it work reliablely, we need to research electricmagnetic field produced by the high voltage and large current, and find out the method to limit that the interference.In this paper we mainly analyse and test the EMI from high voltage large current discharge around low voltage digital delay time circuit, and find out available measurement of restraining EMI. At the first, we investigate electricmagnetic field produced by the high voltage and large current discharge, and its effect on the low voltage digital circuit. Through theory analysing and computer emluating experiment, we find out an available measurement of restraining electromagnetic field radiate interfere. In the next place, we research the influence of transmit EMI on the low voltage digital circuit .Through theory calculating and computer emluating experiment, we find out the mechanism of transmit EMI influences low voltage digital circuit from high voltage large current discharge , and discover an available measurement of restraining transmit EMI. The experiment results are in accord with that of theory analysing and computer emluatingSome theoretical results and experiment in this paper may be useful for the development of the low voltage digital delay time circuit.